export default class StringBuffer {
    /**
     * @description Appends a string to the buffer.
     * @param {string} str The string to append to the buffer.
     * @returns {void}
     */
    append(str: string): void;
    /**
     * @description Converts the buffer to a single string.
     * @returns {string} The concatenated string from all appended parts.
     */
    toString(): string;
    #private;
}